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Analyze Images on Windows
This functionality is available as a menu item of
as a button with the process list. It starts the program
"winimage.exe", which is used to display and analyze
Radiance format pictures.
You may also convert images (save as) so they can be read by
other imaging, paint, or presentation programs. All
commands operating within winimage, with the exception of
redraw, will result in a new image file being created.
The file naming convention in winimage is adding "_" and an
abbreviation of the executed command, ie. "fls" for
falsecolor(1). Thus, if falsecolor(1) is performed on
drawing.pic, the resulting falsecolor(1) image will be
drawing_fls.pic. If an annotation is performed on
drawing_fls.pic, then the resulting image will be
drawing_fls_ann.pic. The original drawing.pic is not
overwritten. However, if falsecolor(1) is performed on the
same image twice, the second version will overwrite the
earlier one.
The File Menu
This menu is used to open Radiance format picture files
and store files in other formats. It is not possible
to load images in other formats, or to directly store
a loaded image in Radiance picture format.
- Open
Load a selected picture file.
- Close
Close the window of the current image.
- Save As
Store the current image in the selected file format.
The Image Menu
This menu offers some general image manipulation operations.
- Redraw
Redraw the display of the current image on screen.
- Exposure
Adjust the exposure level of the selected
image, region, or point with a linear function with
clamping. The adjusted image will be given a name and
saved as a new. pic file automatically as it is being
displayed. This is similar to how a camera works and
can only partially compensate for regions of the image
which are too bright or too dark. The sky outside of
the windows, for example, will appear completely white
if the image is exposed for the interior surfaces. To
make the image darker by picking a point or region,
select a point or region that is bright. To make the
image lighter, choose a point or region that is one of
the darker areas.
- Image
Adjust the exposure by averaging all pixels of an
image.
- Region
Select the region by clicking and dragging.
The enclosed pixels will be averaged and the
resulting value used to determine the appropriate
exposure. If the image has a washed-out or brightly
lit window and a room interior, the window may be selected for
exposing. The resulting new image will be of a
dimmer interior and a window which seems less
bright.
- Point
select a point on the image with the cursor.
The image will be adjusted with the selected point
as the exposure set point.
- Rotate
Rotate the current image either per 90 degrees
clockwise, or per 180 degrees.
- Flip
Flip the current image horizontally or vertically.
The Analysis Menu
This menu offers image operations that are specific to
the type of images that Radiance produces. Note that
The functions available under the analysis menu result in
new images which lose the real-world luminance and
illuminance values, i.e. they become unsuitable for further
manipulations under the analysis menu.
- Human Sensitivity
Similar to an exposure adjustment but uses
nonlinear and linear filters to mimic human
visual perception. This tool compresses the dynamic
range so that most of the details in a high-contrast
image may be displayed simultaneously, similar to the
visual experience one may have in the actual space.
Image
The human sensitivity tool will consider the entire
image to determine the appropriate perceptual exposure
setting. The resulting new image may take a few minutes
to complete, especially for wide-angle views.
The other variations of this command are not
yet available in this version of the program.
- False Color
brings up the Falsecolor(1) Dialog Box. When applied
to a luminance image, falsecolor(1) outputs (Metric)
candela/m2 or (English) footlamberts. When applied to
an illuminance image, falsecolor(1) outputs lux or
footcandle. Note that you need to set the correct
value for the "Quantity" type (luminance or illuminance),
since the program has no way to determine which mode
the original image was computed with.
The number of divisions sets the number of
intermediate, equally spaced values between zero and the
maxium value that will be displayed on the legend. Show
pixel extrema, if selected, will cause falscolor to
annotate the image pixel with the max and min luminance
or illuminance values.
- Iso Contour
Iso contour is similar to falscolor. Both output
images with quantitative measurements. Iso contour
draws demarcation lines in equal steps, according to
number of divisions specified, between zero and the
maxium value. Unlike falsecolor(1), the resulting image
will contain colored lines of equal value overlayed upon
the true color luminance or illuminance image.
- Annotate
brings up the annotate dialog box.
This tool places text on image.
Type the annotation text into the dialog box,
press ok, and an updated image with appear with overlay
text.
The Window Menu
This menu offers some methods to manage the subwindows
in the program.
- New Window
Open another window of the same image. This allows
different parts of the image to be viewed
simultaneously, or for different analyses to be
performed and compared side by side.
- Cascade
Display all open images in a cascading fashion.
- Tile
Display all open images in a tiled fashion.
- Arrange Icons
Line up the minimized image icons at the bottom of
the winimage window.
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